A flower cluster in which stalks of nearly equal length spring from a common centre and form a flat or curved surface, characteristic of the parsley family.
- ‘During field harvest, each plant was separated into leaves (blade + petiole), roots, stems, and umbels (pedicels + rays + flowers/fruits).’
- ‘It is traditionally classified alongside Bupleurum, differentiated by its white flowers, sessile umbels, and conspicuous calyx teeth, and the lack of bracteoles and of a carpophore (mericarps do not separate).’
- ‘Plants produce one or more stems bearing umbels of 10-25 greenishwhite flowers (Shannon and Wyatt 1986a).’
- ‘Ginseng plants with three or more leaves, or rarely two leaves, produce an umbel of small white flowers between late May and July.’
- ‘To minimize competition for resources between developing fruits, treatments were performed on separate umbels, regardless of how many extra flowers per umbel were produced.’
- ‘Unlike other Liliales, these vines produce their flowers in spherical clusters called umbels, as in the picture of Bomarea at the top of this page.’
Late 16th century from obsolete French umbelle or Latin umbella ‘sunshade’, diminutive of umbra (see umbra).